I generally love the capabilities of this app. When it works. When it breaks, usually when there is an update to FF, there is nothing but complete failure. No advance notice from the developer, and all development appears to be reactionary instead of strategic.

The feature set is pretty good, but a little dated and challenging to navigate. Once you get used to the layout, it's pretty easy, though.

Unfortunately, as of Nov 29 2016, it has completely failed and it seems like this extension will no longer be updated. I have nearly a dozen email accounts to track, and getting hit with a sudden unannounced (but planned) failure is absolutely unacceptable.